Added: Nichola Meyerson - Date: 02.12.2021 00:41 - Views: 27544 - Clicks: 8844
Iron and steel slags are often used as subbase materials in the construction of highways. studies have suggested that the free lime CaO in these subbases is responsible for the deposition of calcium carbonate tufa in many highway drains.
Clogging of these drains le to the deterioration of highways. Therefore, to classify the tufa-producing potential of these slags, it is necessary to determine the total original CaO. Thermogravimetry TG methods were employed and most of the TG plots indicated two major changes in weight loss--dehydroxylation of Ca OH 2 and dissociation of carbonates.
From these changes in weight loss the percentage of CaO was calculated. These calculated percentages of CaO from the TG plot plus the from the "sugar test" determine the total original percentage of CaO. TG methods and the sugar test are excellent and economical ways to characterize the original CaO in slags and the susceptibility of the slags to precipitate CaCO3 in subdrains of highways.
Toggle Menu. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences.Free slags
email: [email protected] - phone:(422) 614-9517 x 8292
User Guidelines for Waste and Byproduct Materials in Pavement Construction